Paper Forming a Cavity Between a Tobacco Rod and a Filter Segment

ABSTRACT

The invention relates to a Heat-Not-Burn smoking construction with at least one tobacco segment, at least one cooling tube and a filter comprising an upstream hollow filter segment and a downstream filled filter segment. The filter segments are wrapped with at least one first combining wrapper. The cooling tube and the filter are surrounded by a second combining wrapper or tipping paper extending partially on the tobacco segment to attach the filter and cooling tube to the tobacco segment. The cooling tube is formed between the filter and the tobacco segment by the first combining wrapper, which surrounds the filter and forms a cavity between the tobacco segment and the filter to provide a cavity that extends a length beyond the upstream hollow filter segment. The invention also relates to a method for manufacturing one or two heat-not-burn smoking constructions.

DESCRIPTION

The invention relates to a Heat-Not-Burn smoking construction as forexample a cigarette with at least one tobacco segment, at least onecooling tube and a filter comprising at least an upstream hollow filtersegment and a downstream filled filter segment adjacent to the hollowfilter segment. The filter segments are wrapped with at least one firstcombining wrapper. The cooling tube and the filter are preferablysurrounded by a second combining wrapper. The cooling tube is formedbetween the filter and the tobacco segment by the first combiningwrapper, which surrounds the filter and forms a cavity between thetobacco segment and the filter. The invention also relates to a methodfor manufacturing one or two heat-not-burn smoking constructions.

Smoking articles, such as cigarettes, are widespread consumer goods.Generally, cigarettes consist out of at least two parts, a filter partand tobacco part. The tobacco is often formed as a rod surrounded bypaper material to keep the tobacco in shape. Typically, the tobacco rodand the filter are attached to one another and held together by atipping paper.

Generally similar constructions can also be used for electroniccigarettes (e-cigarettes). They come with the need and possibility fornovel tobacco products, wherein the tobacco is heated but not burned.Those heat not burn constructions are used in a combination withelectronic device providing a heater. The smoke, which will be generatedby the heater in combination with the tobacco part of the constructionis directed through a filter and to the mouth of a consumer.

However, as the hot smoke must be cooled down, there is a need forHeat-Not-Burn constructions to be more complex than conventionalcombustible cigarettes. Therefore many Heat-Not-Burn articles consist ofspecial filter elements, tubular elements such as paper tubes, thetobacco part and a wrapper to combine these parts. Moreover, the tobacconeeds to be especially prepared for use with an electronic heater.

The complexity of Heat-Not-Burn articles causes high production costs asthe different parts have to be produced in different steps and combinedin further steps. Additionally, due to the special and/or additionalelements e.g. the tubular elements or special filters, the productioncosts of Heat-Not-Burn articles are much higher in relation toconventional combustible smoking articles.

It is therefore the objective of the invention to reduce productioncosts of Heat-Not-Burn articles by providing a Heat-Not-Burn articlewith a reduced complexity.

The afore mentioned problems/drawbacks are solved/eliminated by aHeat-Not-Burn smoking construction, wherein the smoking constructionextends in a length direction and comprises a longitudinal axis, alongwhich at least one tobacco segment comprising tobacco, at least onecooling tube and a filter comprising at least two adjacent filtersegments. The filter segments are wrapped with at least one firstcombining wrapper. The cooling tube and the filter being surrounded by asecond combining wrapper or tipping paper extending partially on thetobacco segment to attach the filter and cooling tube to the tobaccosegment.

The filter segments are preferably an upstream hollow filter segment anda downstream filled filter segment adjacent the hollow filter segment.

The afore mentioned problems are also eliminated by a Heat-Not-Burnsmoking construction, wherein the smoking construction extends in alength direction and comprising a longitudinal axis, along which atleast one tobacco segment comprising tobacco, at least one cooling tubeand a filter comprising at least a filter segment, preferably twoadjacent filter segments. The filter segment or segments are wrappedwith at least one first combining wrapper. The cooling tube and thefilter being surrounded by a second combining wrapper or tipping paperextending partially on the tobacco segment to attach the filter andcooling tube to the tobacco segment.

The filter segments are preferably an upstream hollow filter segment anda downstream filled filter segment adjacent the hollow filter segment.When the filter is a single filter segment, the filter segment ispreferably a filled filter segment.

Since the tobacco segment is attached to the wrapped filter by thesecond combining paper, the tobacco segment is not wrapped by the firstcombining wrapper. The first combining paper is preferably adjacent tothe tobacco segment.

The cooling tube is formed between the filter and the tobacco segment bythe first combining wrapper, which surrounds the filter and forms acavity between the tobacco segment and the filter that extends along acertain length beyond the filter, in particular beyond the upstreamhollow filter segment.

Preferably, the first combining wrapper and the filter and/or at leasttwo filter segments form a recess dual filter comprising at least onerecess at the filter and/or at least one of the filter segments.Ideally, the upstream hollow filter segment comprises a tubular partwhich forms an extension of the cooling tube. Such a construction withthe cooling tube guarantees that the hot smoke cools down before itreaches a mouth of a consumer. Moreover, materials which are needed forthe production of separate paper tubes can be saved so that the overallproduction costs are reduced.

In a preferred embodiment, the first and/or second combining wrappercomprises a paper, carton and/or cardboard material so that the tube isprotected against mechanical stress. In a preferred embodiment, thepaper, carton or cardboard material has a weight higher than 60 gsm,preferably higher than 75 gsm, preferably higher than 90 gsm and/or aweight lower than 200 gsm, preferably lower than 150 gsm, preferablylower than 125 gsm.

Preferably, the first combining wrapper is thicker and/or has a higherbasis weight than the second combining wrapper. The second combiningwrapper is also longer than the first combining wrapper.

In a preferred embodiment, the first and/or second combining wrapper islabelled and/or printed to provide important information e.g. to the useor the origin of the Heat-Not-Burn smoking construction.

It is further conceivable that the cooling tube comprises a papermaterial. Preferably, the tube comprises just one layer or a smallnumber e.g. two, three or more layers of paper material. The papermaterial may comprise a paper or cardboard material to provide a higherstiffness and/or mechanical protection of the tube.

According to a preferred embodiment, the cooling tube extends along alongitudinal axis in a length larger than 15 mm, preferably larger than20 mm, preferably larger than 25 mm, preferably larger than 32 mm and/orsmaller than 45 mm, preferably smaller than 40 mm, preferably smallerthan 37 mm. Ideally, the cooling tube extends along a length between 10mm and 25 mm and especially a length larger than 20 mm. Preferably thecooling tube extends along a length larger than 10 mm. This way, acooling distance through the cooling tube is sufficient to cool down thehot smoke.

In a preferred embodiment, a length of the cooling tube is shorter thana length of the first combining wrapper (or respectively the first paperwrapper). The length of the cooling tube may be equal to the distancebetween the filter and especially the upstream hollow filter segment andthe tobacco segment. The cooling tube is then protected againstmechanical stress by the material of the combining wrapper.

In a preferred embodiment, the cooling tube forms an empty cavity. Inanother embodiment, the cooling tube, preferably cavity, is filled witha filler material such as fibers or insert. The fibers may be made ofnatural material e.g. cellulose fibers, plant fibers or the like. It isalso possible that the cavity is filled with a heat absorbing material.The cavity and/or a filled cavity beneficially cools down the hot streamto a level comfortable for a consumer. A filled cavity may alsostabilize the cooling tube.

In a further preferred embodiment, a length of the cavity is larger thanor equal to a length of the filter. Preferably, the length of the cavityis equal to the length of the cooling tube. Ideally, the filter extendsalong a length larger than 8 mm, preferably larger than 10 mm,preferably larger than 12 mm and/or smaller than 22 mm, preferablysmaller than 20 mm, preferably smaller than 17 mm. Preferably, theupstream hollow filter segment and/or the downstream filled filtersegment extends along a length larger than 3 mm, preferably larger than5 mm, preferably larger than 7 mm and/or smaller than 12 mm, preferablysmaller than 10 mm, preferably smaller than 8 mm.

Ideally, the upstream hollow filter segment and/or the downstream filledfilter segment extends along a length of between 6 mm and 9 mm. A lengthof the cooling tube and the tubular part in combination is then ofsufficient length to cool down the hot stream on its way through theHeat-Not-Burn smoking construction.

In another preferred embodiment, the length of the cooling tube islarger or equal to a length of the tobacco segment. Ideally, the lengthof the cooling tube is larger or equal to a length of the tobaccosegment to provide enough space for the hot smoke within the coolingtube. Preferably, the tobacco segment extends along a length larger than10 mm, preferably larger than 15 mm, preferably larger than 20 mm and/orsmaller than 40 mm, preferably smaller than 30 mm, preferably smallerthan 25 mm. In an example, the length of the filter is equal to thelength of the cooling tube and equal to the length of the tobaccosegment. For example, the same length for the three parts is about 20mm.

In another embodiment, the length of the cavity and/or the cooling tubeis larger than the length of one filter segment and/or the filter. Alength of the cooling tube and the tubular part in combination is thenof sufficient length to cool down the hot stream on its way through theHeat-Not-Burn smoking construction.

According to a preferred embodiment, a length of the second combiningwrapper is larger than the length of the filter and the length of thecooling tube together. Ideally, the length of the second combiningwrapper is equal to or smaller than a length of the tobacco segment, thelength of the filter and the length of the cooling tube all together.The length of the second combining wrapper may be larger than a lengthof the first combining wrapper. Preferably, the length of the secondcombining wrapper is larger than 30 mm, preferably larger than 35 mm,preferably larger than 40 mm and/or smaller than 60 mm, preferablysmaller than 55 mm, preferably smaller than 50 mm.

It is further conceivable that the length of the first combining wrapperis equal to a length of the filter and the length of the cooling tubeand/or the cavity together. Preferably, the length of the firstcombining wrapper is larger than 25 mm, preferably larger than 30 mm,preferably larger than 35 mm and/or smaller than 50 mm, preferablysmaller than 45 mm, preferably smaller than 40 mm. Such arrangementguarantees a sufficient stiffness of the first and second wrapper incombination that protects the Heat-Not-Burn smoking construction.

According to the invention, the second combining wrapper overlaps thefirst combining wrapper. In a preferred embodiment, the second combiningwrapper overlaps the first combining wrapper along at least a part ofthe length of the first combining wrapper. Ideally, the second combiningwrapper completely overlaps the first combining wrapper. Sucharrangement guarantees a sufficient stiffness of the first and secondwrapper in combination that protects the Heat-Not-Burn smokingconstruction.

In a preferred embodiment, at least one ventilation hole and preferablyseveral ventilation holes are provided in the cooling tube. Ideally, theventilation holes are arranged in line one behind the other and inparticular this line is arranged circumferentially around the coolingtube. It may be possible that the cooling tube or rather the smokingconstruction comprises one or more e.g. two or three lines ofventilation holes, wherein the lines may be arranged next to each other.One or more lines of ventilation holes may be arranged lengthwise on thecooling tube or rather the smoking construction. Ideally, theventilation holes break through the first and/or the second combiningwrapper. Preferably, the ventilation holes form a fluid connection froman outside of the smoking construction to an inner compartment of thecooling tube. Ventilation holes provide an air or gas supply to supportthe cooling of the hot stream. In a preferred embodiment, theventilation holes may be produced by lasering through the material ofthe first and second combining wrappers.

In a preferred embodiment, the filled filter segment comprises acetateor paper tow. The filled filter segment is generally a tow of fiber orfilaments gathered and formed into a rod. Preferably, the hollow filtersegment also comprises acetate. The acetate may comprise celluloseacetate and in particular cellulose acetate fibers. Ideally, the acetateof the hollow filter segment has a higher density than the acetate ofthe filled filter segment to ensure that the hot stream from the tobaccosegment is mainly directed through the tubular part of the hollow filtersegment to the filled filter segment. It may be possible that theacetate of the hollow filter segment has a lower or equal density thanthe acetate of the filled filter segment. The acetate and especially thecellulose acetate fibers of at least one of the filter segments providea good filtration ability of the smoke. In a possible alternative thefilter segments comprise paper tow.

In a preferred embodiment, the tobacco segment comprises reconstitutedtobacco. The tobacco segment may also comprise strands of tobaccosheets, whole tobacco leafs and/or shredded tobacco. It is possible thatthe strands of tobacco sheets and/or the shredded tobacco particles areoriented or randomly oriented. Preferably, the strands of tobaccosheets, whole tobacco leafs and/or shredded tobacco are surrounded by asheet comprising reconstituted tobacco. The sheet may be larger than adiameter of the tobacco segment. Ideally, the tobacco segment iscompletely made of reconstituted tobacco. The use of reconstitutedtobacco provides a good adjustment of physical properties of the tobaccosegment and reduces production costs.

In a preferred embodiment, the tobacco comprises strands of tobaccosheet and/or folded sheets comprising tobacco powder and/or preferablymore than wt. 5% of aerosol generating agent. The tobacco preferablycomprises more than wt. 5% glycerin, preferably more than wt. 8% ofglycerin, preferably more than wt. 10% of glycerin. Such amounts ofglycerin help to keep the tobacco moist and formable.

Suitable aerosol generating agents include: a polyol such as sorbitol,glycerol, and glycols like propylene glycol or triethylene glycol; anon-polyol such as monohydric alcohols, acids such as lactic acid,glycerol derivatives, esters such as triacetin, triethylene glycoldiacetate, triethyl citrate. In some embodiments, the aerosol generatingagent may be glycerol, propylene glycol, or a mixture of glycerol andpropylene glycol.

In a preferred embodiment, the cooling tube comprises a tubularreinforcement material. Preferably the tubular reinforcement materialcomprises materials which are particularly stable against moisture,aerosol and/or vape. It is conceivable that the tubular reinforcementmaterial comprises cardboard. In an example the tubular reinforcementmaterial is preferably provided as a tubular part for being attached tothe filter, preferably the hollow filter segment.

It is also conceivable to provide the tubular reinforcement material asadditional wrapping. In this case, it is possible to wrap thereinforcement material to a tubular shape and attach this to the filter,preferably hollow filter segment, with a first combining wrapper.

The objective is also reached by a method for manufacturing aheat-not-burn smoking construction with the steps:

-   -   Providing a tobacco segment and at least a filter formed of at        least two filter segments,    -   Wrapping the first filter with a first combining wrapper to        obtain a first wrapped filter, wherein a cooling tube is formed        as a cavity surrounded by the first combining wrapper, wherein a        length of the tube is longer than a length of the first filter        to create a cooling cavity at at least one side of the wrapped        filter,    -   Wrapping the first wrapped filter and at least a part of the        tobacco segment with a second combining wrapper such that the        cavity is situated between the filter and the tobacco segment.

In first step, the tobacco segment comprises at least a first filter,which is preferably formed of at least two filter segments and inparticular two different filter segments, and especially at least one ofan upstream hollow filter segment and a downstream filled filtersegment. Ideally, the filled filter segment will be arranged adjacent tothe hollow filter segment so that smoke can be directed through thehollow filter segment and subsequently through the filled filtersegment.

A next step provides the wrapping of the upstream hollow filter segmentand the downstream filled filter segment with a first combining wrapperto produce the first wrapped filter and the cooling tube. Ideally, thehollow filter segment will be positioned between the cooling tube andthe filled filter segment. A length of the cooling tube is preferablylonger than a length of the first filter to create a cooling cavity inthe form of the cooling tube at at least one side of the wrapped filter.Preferably, the filter segments will be wrapped with the first wrapperand the cooling cavity, especially in the form of the cooling tube isformed by the first wrapper. Ideally, the cooling tube and the firstwrapped filter will be surrounded by a second combining wrapper ortipping paper to provide a good protection against mechanical stress.

A next step provides the wrapping of the first (wrapped) filter and atleast a part of the tobacco segment with the second combining wrappersuch that the cavity and especially the cooling tube is situated betweenthe filter and the tobacco segment and possibly more specifically,between the hollow filter segment and the tobacco segment. The tobaccosegment may be wrapped completely with the second combining wrapper. Thesecond combining wrapper provides a good attachment of the first wrappedfilter with the cooling tube and the tobacco segment.

In a preferred embodiment, the method comprises an additional step ofwrapping the first and a second filter with a first combining wrapper toobtain a double length wrapped filter. The double length tube is formedbetween the first and second filter. Moreover, the length of the doublelength tube is equal to or longer than a length of the first and secondfilter together to create a cooling cavity between the first and secondfilter. Producing a double length wrapped filter reduces the productionsteps and therefore also the production costs.

In a further preferred embodiment, the method comprises an additionalstep of cutting the double length wrapped filter to create a first and asecond wrapped filter comprising a first cooling tube and a secondcooling tube. With a first and a second wrapped filter two smokingconstructions can be produced.

In a further preferred embodiment, the method comprises an additionalstep of wrapping a double length filled filter segment and two hollowfilter segments with a double length first combining wrapper to obtain adouble length wrapped filter. Ideally, the length of the double lengthfirst combining wrapper extends a length of the double length filledfilter segment and of the two hollow filter segments together to obtaintwo cavities, which form cooling tubes, which in particular are formedby the double length first combining wrapper. At least one of the twohollow filter segments may be arranged at, and especially adjacent to anend of the double length filled filter segment. At least one of the twocooling tubes are arranged at, and especially adjacent to one of thehollow filter segments. At least one of the hollow filter segments maybe positioned between a cooling tube and the double length first filter.

In a further preferred embodiment, the method comprises an additionalstep of cutting the double length wrapped filter to create a first and asecond wrapped filter. Preferably the double length wrapped filter iscut in the middle of the double length filled filter segment to create afirst and a second wrapped filter. A length of the first wrapped filtermay be equal to a length of the second wrapped filter. With a first anda second wrapped filter two smoking constructions can be produced.

In a preferred embodiment, the first and/or second combining wrapper areformed with properties as described above.

The objective is also reached by a method for manufacturing twoheat-not-burn smoking constructions with the steps:

-   -   Providing a tobacco segment and at least a first and a second        wrapped filter according to the description above,    -   Placing the tobacco segment between the first and second wrapped        filter, wherein the cooling tube of each filter is positioned        between the tobacco segment and a filter segment of each wrapped        filter,    -   Wrapping each of the first and second wrapped filter and at        least two separate parts of the tobacco segment with two        separate second combining wrappers or wrapping the tobacco        segment and the first and second wrapped filter with one common        combining wrapper to create a double length smoking        construction, wherein the cavity of each wrapped filter are        created between each filter and the tobacco segment,    -   Cutting the double length smoking construction at a middle of        the tobacco segment to create two smoking constructions.

The tobacco segment is preferably dimensioned for two heat-not-burnsmoking constructions. The cutting of the double length smokingconstructions is done in the middle of the tobacco segment.

Ideally, for wrapping the first and/or second wrapped filter the firstcombining wrapper as described above is used. The method of theproduction of two smoking constructions enables the production of twosmoking constructions in one production line or rather one productionprocess so that production costs will be reduced in comparison with aseparate production of two individual smoking constructions.

Further advantages, objectives and features of the present inventionwill be described, by way of example only, in the following descriptionwith reference to the appended figures. In the figures, like componentsin different embodiments can exhibit the same reference symbols.

The figures show:

FIG. 1 Schematic view of the smoking construction and its components;

FIG. 2 Chart of the method for manufacturing a heat-not-burn smokingconstruction;

FIG. 3 Cross-sectional view of the double length filter with a doublelength cooling tubes;

FIG. 4 Cross-sectional view of the double length filter with a doublelength filled filter segment;

FIG. 5 a Cross-sectional view of the double length smoking constructionwith a double length filled filter segment;

FIG. 5 b Cross-sectional view of the double length smoking constructionwith a double length tobacco segment.

In FIG. 1 a smoking construction 1 with a tobacco segment 10, a coolingtube 20, an upstream hollow filter segment 30, a downstream filledfilter segment 40, a first combining wrapper 50 and a second combiningwrapper 60 is shown. Along a longitudinal axis 3, the tobacco segment10, the cooling tube 20, the hollow filter segment 30 and the filledfilter segment are arranged. Ideally, these components are arrangedadjacent to each other, especially in said sequence and in particularone behind the other.

Preferably, the first combining wrapper 50 is arranged such that itsurrounds the hollow filter segment 30 and the filled filter segment 40such that a wrapped filter is formed. The wrapped first combiningwrapper 50 forms a cavity 20 a such that the cooling tube, is formedwherein the cooling tube is defined by the cavity 20 a and thesurrounding first combining wrapper 50.

The hollow filter segment 30 comprises a tubular part 31, wherein thetubular part is ideally arranged such that it is arranged adjacent tocooling tube 20 and in particular such that the tubular part 31 definesan extension of the cooling tube 20.

The second combining wrapper 60 may be arranged such that it at leastpartially, preferably completely overlaps the first combining wrapper50. Moreover, the second combining wrapper 60 is preferably arrangedsuch that it surrounds the wrapped filter and at least a part of thetobacco segment 10, wherein the second combining wrapper 60 preferablyattaches the tobacco segment 10 and the wrapped filter. The cooling tube20 in the form of the cavity 20 a may be arranged between the tobaccosegment 10 and the hollow filter segment 30 or the filled segment 40.The filled filter segment 40 is preferably arranged adjacent to thehollow filter segment 30 and in particular at a proximal end of thesmoking construction 1, wherein the hollow filter segment 30 is ideallyarranged between the cooling tube 20 and the filled filter segment 40.

All components and especially the tobacco segment 10, the cooling tube20, the hollow filter segment 30 and the filled filter segment 40 arearranged concentrically around the longitudinal axis 3. Ideally, thefirst combining wrapper 50 circumferentially encloses the cooling tube20, the hollow filter segment 30 and the filled filter segment 40 toform the wrapped filter. The second combining wrapper 60 maycircumferentially encloses the wrapped filter and at least a part of thetobacco segment 10.

The first 50 and/or second combining wrapper 60 comprises a paper,carton, cardboard material and/or aluminium foil, acetate cellulose filmwhich preferably has a weight higher than 60 gsm, preferably higher than75 gsm, preferably higher than 90 gsm and/or a weight preferably lowerthan 200 gsm, preferably lower than 150 gsm, preferably lower than 125gsm.

The filled filter segment 30 and/or the hollow filter segment 40 maycomprise acetate and preferably cellulose acetate fibers. Ideally, theacetate of the filled filter segment 40 has a lower density than theacetate of the hollow filter segment 30.

The cavity 20 a may be filled with a filler material such as fibers,which are preferably made of natural material e.g. cellulose fibers,plant fibers or the like. It may also be possible that the cavity 20 ais filled with a heat absorbing material.

The tobacco segment 10 may comprise reconstituted tobacco, preferablyrandom oriented strands of tobacco sheets, whole tobacco leafs and/orshredded tobacco. Ideally, the tobacco segment comprises tobacco powderand/or at least one, preferably more sheets, which comprisereconstituted tobacco and/or more than wt. 5% of glycerin, preferablymore than wt. 8% of glycerin, preferably more than wt. 10% of glycerin.

Preferably a length of the tobacco segment 100, of the cooling tube 70,in particular in the form of the cavity 20 a, of the hollow filtersegment 91, of the filled filter segment 40, of the filter comprisingone or both filter segments 90, of the wrapped filter 110 comprising thefilter and the cooling tube 20, of the first combining wrapper 80, ofthe second combining wrapper 120 and of the smoking construction 130extends in the length direction. The length of the filter 90 may definea combined length of the length of the hollow filter segment 91 and thelength of the filled filter segment 40. Further, the length of thewrapped filter 110 and/or the length of the first combining wrapper 80defines a combined length of the length of the hollow filter segment 91,the length of the filled filter segment 40 and the length of the coolingtube 70. The length of the cooling tube may be larger than the length ofthe cavity 20 a, which is positioned in the cooling tube.

The length of the tobacco segment 100 may be larger than, smaller thanor equal to the length of the cooling tube 70. Ideally, the length ofthe tobacco segment 100 is equal to the length of the cooling tube 70.The length of the tobacco segment 100 may be larger, smaller or equal tothe length of the filter 90. Preferably, the length of the tobaccosegment 100 is smaller than the length of the filter 90. The length ofthe tobacco segment 100 may be larger, smaller or equal to the length ofthe hollow 91 or filled filter segment 92. Ideally, the length of thetobacco segment 100 is larger than the length of the hollow 91 or filledfilter segment 92. The length of the tobacco segment 100 may be largerthan, smaller than or equal to the length wrapped filter 110 and/or thefirst combining wrapper 80. Ideally, the length of the tobacco segment100 is smaller than the length wrapped filter 110 and/or the firstcombining wrapper 80.

The length of the cooling tube 70 and/or the cavity 20 a may be largerthan, smaller than or equal to the length of the filter 90. Ideally, thelength of the cooling tube 70 and/or the cavity 20 a is larger than thelength of the filter 90. The length of the cooling tube 70 and/or thecavity 20 a may be larger than, smaller than or equal to the length ofthe hollow 91 and/or filled filter segment 92. Ideally, the length ofthe cooling tube 70 and/or the cavity 20 a is smaller than the length ofthe hollow 91 and/or filled filter segment 92. The length of the coolingtube 70 and/or the cavity 20 a may also be smaller than the first 80and/or the second combining wrapper 80 and especially smaller than thelength of the second combining wrapper 120.

The length of the hollow filter segment 91 may be larger than, smallerthan or equal to the length of the filled filter segment 92. Ideally,the length of the hollow filter segment 91 is smaller than the length ofthe filled filter segment 92. Further, the length of the smokingconstruction 130 may be larger than or equal to the length of the secondcombining wrapper 120, wherein the length of the first combining wrapper80 may be smaller than or equal to the length of the second combiningwrapper 120.

The length of the tobacco segment is preferably larger than 10 mm,preferably larger than 15 mm, preferably larger than 20 mm and/orsmaller than 40 mm, preferably smaller than 30 mm, preferably smallerthan 25 mm. The length of the cooling tube 70 may be larger than 15 mm,preferably larger than 25 mm, preferably larger than 32 mm and/orsmaller than 45 mm, preferably smaller than 40 mm, preferably smallerthan 37 mm. Ideally, the length of the cooling tube 70 is between 10 mmand 25 mm and especially larger than 20 mm, preferably larger than 10mm. Ideally, the length of the filter 90 is larger than 8 mm, preferablylarger than 10 mm, preferably larger than 12 mm and/or smaller than 22mm, preferably smaller than 20 mm, preferably smaller than 17 mm.

Moreover, the length of the hollow filter segment 91 and/or the filledfilter segment 92 is larger than 3 mm, preferably larger than 5 mm,preferably larger than 7 mm and/or smaller than 12 mm, preferablysmaller than 10 mm, preferably smaller than 8 mm. Ideally, the length ofthe first combining wrapper 80 and/or of the wrapped filter 110 islarger than 25 mm, preferably larger than 30 mm, preferably larger than35 mm and/or smaller than 50 mm, preferably smaller than 45 mm,preferably smaller than 40 mm. Preferably, the length of the secondcombining wrapper 120 and/or the of the smoking construction is largerthan 30 mm, preferably larger than 35 mm, preferably larger than 40 mmand/or smaller than 60 mm, preferably smaller than 55 mm, preferablysmaller than 50 mm. Ideally, the length of the smoking construction islarger than 35 mm, preferably larger than 45 mm, preferably larger than50 mm and/or smaller than 70 mm, preferably smaller than 65 mm,preferably smaller than 60 mm.

The smoking construction preferably comprises ventilation holes 5, whichare arranged at the cooling tube 70. Ideally, the ventilation holes 5are arranged in line one behind the other and in particular this line isarranged circumferentially around the cooling tube 70. The line ofventilation holes 5 may also be arranged perpendicular to the lengthdirection 2. The smoking construction may also comprise one or more e.g.two or three lines of ventilation holes 5, which may be arranged next toeach other. Ideally, the ventilation holes 5 break through the firstand/or the second combining wrapper in a radial direction and inparticular in a direction perpendicular to the length direction 2.

FIG. 2 shows a chart illustrating the method 200 for manufacturing aheat-not-burn smoking construction 1. In a first step 201, at least one,preferably two tobacco segments 10 are provided, wherein the tobaccosegments 10 may be formed as described above. In a further step 202, atleast one first filter is formed, wherein the first filter ideallycomprises at least two and preferably exactly two filter segments.Preferably, the first filter comprises the hollow filter segment 30 andthe filled filter segment 40.

In a next step 203, the first filter is wrapped with a first combiningwrapper to obtain a first wrapped filter, wherein the cooling tube maybe formed as a cavity 20 a that is surrounded by the first combiningwrapper 50. Ideally, the length of the cooling tube 70 is longer thanthe length of the first filter 90 to create the cavity 20 a at at leastone side of the first wrapped filter. It is possible that the firstcombining wrapper 50, the cooling tube 20, the hollow filter segment 30and/or the filled filter segment are arranged as described above and/orformed as described above. The first combining wrapper ideally has aspecific weight of 60 gsm, preferably higher than 75 gsm, preferablyhigher than 90 gsm and/or a weight preferably lower than 200 gsm,preferably lower than 150 gsm, preferably lower than 125 gsm.

The step 203 may comprise an intermediate step 203 a of wrapping thefirst and a second filter with a double length cooling tube to obtain adouble length wrapped filter. The double length tube may be positionedbetween the first and second filter, wherein ideally the double lengthcooling tube is positioned between two hollow filter segments 30.Further, the length of the double length tube is preferably longer thana length of the first and second filter together. An optional furtherintermediate 203 b step provides a cutting of the double length wrappedfilter to create a first and a second wrapped filter. In this case, asecond tobacco segment may be provided in a step 201 b.

In an alternative step 302 a double length filled filter segment and atleast two hollow filter segments 30 are provided and in a furtheralternative step 303 wrapped together with a double length firstcombining wrapper to obtain the double length wrapped filter. Ideally,at least one of the hollow filter segments is arranged adjacent to anend of the double length filled filter segment, in particular such thedouble length filled filter segment is positioned between the hollowfilter segments 30. A length of the double length first combiningwrapper may be longer than a combined length of the double length filledfilter segment and the two hollow filter segments, such that doublelength first combining wrapper extends beyond the hollow filter segments30 to form two cavities. The cavities may be surrounded by the doublelength first combining wrapper and/or form the cooling tubes 20. Atleast one of the two cooling tubes are arranged at, and especiallyadjacent to one of the hollow filter segments 30. At least one of thehollow filter segments may be positioned between a cooling tube and thedouble length first filter.

In a further alternative step 303 b the double length wrapped filter iscut to create a first and a second wrapped filter. Preferably the doublelength wrapped filter is cut in the middle of the double length filledfilter segment to create a first and a second wrapped filter.

In a further step 204 the first and/or a second wrapped filter will eachbe wrapped together with at least a part of a tobacco segment 10 with asecond combining wrapper 60 such that the cavity 20 a or rather thecooling tube 20 is positioned between a filter and the tobacco segment.It is possible that the first combining wrapper 50, the cooling tube 20,the hollow filter segment 30 and/or the filled filter segment 40 arearranged as described above and/or formed as described above.

FIG. 3 shows a cross-sectional view of the double length filter 4 with adouble length cooling tube 20. The shown double length filter 4construction comprises at least one double length cooling tube 20 or twocooling tubes 20 attached to each other, two hollow filter segments 30,and two filled filter segments 40. The double length filter 4construction is preferably wrapped in at least one double length firstcombining wrapper 50. It is also conceivable to use two or morewrappings in the double length filter 4 constructions. Each of thehollow filter segments 30 preferably comprise tubular parts 31. Thefirst filter 4 construction is connected at a middle M to the secondfilter 4 construction. It is conceivable that the shown double lengthfilter 4 construction comprises a double length cooling tube 20 which isdivisible at the middle M in two separate cooling tubes 20. The firstseparated cooling tube 20 is preferably a part of the double lengthcooling tube 20 and is connected to the first filter 4 construction. Thesecond separated cooling tube 20 is preferably another part of thedouble length cooling tube 20 being connected to the second filter 4construction. Preferably both parts of the double length cooling tube 20are equal to each other. Preferably two separated filter 4 constructionsequal to each other are divisible by cutting the double length filter 4construction at the middle M, in particular at the middle M of thedouble length cooling tube 20.

FIG. 4 shows a cross-sectional view of the double length filter 4 with adouble length filled filter segment 40. This example of the doublelength filter 4 construction is substantially similar to the exampleshown in FIG. 3 . Preferably the shown double length filter 4construction comprises at least the double length filled filter segment40 or two filled filter segments 40 which are attached to each other,two hollow filter segments 30 comprising tubular parts 31 and twocooling tubes 20. The double length filter 4 construction furthercomprises at least a double length first combining wrapper 50. Similarto the double length filter 4 construction shown in FIG. 3 , the filter4 construction could also comprise more than one wrapping, preferablytwo wrappings. It is particularly advantageous for stability of thewhole double length filter 4 construction.

The double length filter 4 construction is preferably divisible bycutting at the middle M. Preferably the middle M of the double lengthfilter 4 construction corresponds to the middle M of the double lengthfilled filter segment 40. Also preferably the double length filledfilter segment 40 is divisible in two parts. Preferably the first filledfilter segment 40 being a part of the double length filled filtersegment 40 is connected to the first hollow filter segment 40 and to thefirst cooling tube 20. Preferably the second filled filter segment 40being a part of the double length filled filter segment 40 is connectedto the second hollow filter segment 40 and to the second cooling tube20. Preferably both parts of the double length filled filter segments 40are equal to each other.

The shown double length filter 4 constructions in FIGS. 3 and 4 arepreferably attachable to several kinds of smoking constructions 1,preferably to the heat-not-burn smoking constructions.

FIG. 5 a shows a cross-sectional view of the double length smokingconstruction 1 with a double length filled filter segment 40. Preferablythe double length smoking construction 1 comprises at least two filters4 and two tobacco segments 10. Each of two filters 4 preferablycomprises at least a cooling tube 20, a hollow filter segment 30 and afilled filter segment 40. Preferably the hollow filter segments 30comprise tubular parts 31. The whole double length smoking construction1 is preferably wrapped at least in a double length first combiningwrapper 50 and a double length second combining wrapper 60. As thetobacco segments have their own wrapper before their placement againstthe double length filter construction, the second combining wrapper 60may extend partially on the tobacco segments 10 (without extending tothe free end of the tobacco segments). It is also conceivable to providemore than two wrappers for this construction 1.

Preferably the double length filled filter segment 40 or the wholefilter 4 corresponds to the example shown in FIG. 4 . The double lengthfilled filter segment 40 is preferably divisible at the middle M of thedouble length smoking construction 1 or the middle M of the doublelength filled filter segment 40. In particular, the middle M of thedouble length smoking construction 1 corresponds to the middle M of thedouble length filled filter segment 40.

FIG. 5 b shows a cross-sectional view of the double length smokingconstruction 1 with a double length tobacco segment 10. Preferably thedouble length smoking construction 1 comprises at least two filters 4and a double length tobacco segment 10. The filters 4 preferablycomprise at least a cooling tube 20, a hollow filter segment 30 and afilled filter segment 40. Preferably the hollow filter segments 30comprise tubular parts 31. The whole double length smoking construction1 is preferably wrapped at least in two first combining wrapper 50 and adouble length second combining wrapper 60. The double length tobaccosegment 10 is preferably divisible at the middle M of the double lengthsmoking construction 1 or the middle M of the double length tobaccosegment 10. In particular, the middle M of the double length smokingconstruction 1 corresponds to the middle M of the double length tobaccosegment 10. In an alternative, the second combining wrapper 60 can beformed of two separate second combining wrappers separately combiningthe filters 4 to the double length tobacco segment 10. In this case, thetwo second combining wrappers 60 do not overlap or extend to the middleM of the double length tobacco segment 10.

Preferably the double length tobacco segment 10 is divided by cutting intwo parts. First part of the double length tobacco segment 10 ispreferably attached to the first filter 4. Second part of the doublelength tobacco segment 10 is preferably attached to the second filter 4.

The applicant reserves his right to claim all features disclosed in theapplication document as being an essential feature of the invention, aslong as they are new, individually or in combination, in view of theprior art. Furthermore, it is noted that in the figures features aredescribed, which can be advantageous individually. Someone skilled inthe art will directly recognize that a specific feature being disclosedin a figure can be advantageous also without the adoption of furtherfeatures from this figure. Furthermore, someone skilled in the art willrecognize that advantages can evolve from a combination of diversefeatures being disclosed in one or various figures.

LIST OF REFERENCE SYMBOLS

1 Smoking construction

2 Length direction

3 Longitudinal axis

5 Ventilation holes

10 Tobacco segment

20 Cooling tube

20 a Cavity in the cooling tube

30 Hollow filter segment

31 Tubular part of the hollow filter segment

40 Filled filter segment

50 First combining wrapper

60 Second combining wrapper

70 Length of the cooling tube

80 Length of the first combining wrapper

90 Length of the filter

100 Length of the tobacco segment

110 Length of the wrapped filter

120 Length of the second combining wrapper

130 Length of the smoking construction

200 Method of producing the smoking construction

201 Providing the tobacco segment

201 b Providing a second tobacco segment

202 Providing a filter

203 Wrapping at least one filter and creating the cooling tube

203 a Creating a double length wrapped filter

203 b Cutting the double length filter

204 Wrapping a wrapped filter and the tobacco segment

302 Providing a double length filled filter segment

303 Wrapping the double length filled filter segment and two hollowfilter segments

303 b Cutting a double length wrapped filter

M Middle of the double length filter/Middle of the double length smokingconstruction

1. A Heat-Not-Burn smoking construction, wherein the smoking construction extends in a length direction and comprises a longitudinal axis, along which at least one tobacco segment comprising tobacco is provided, at least one cooling tube, and a filter comprising at least an upstream hollow filter segment and a downstream filled filter segment adjacent to the upstream hollow filter segment, wherein the filter segments are wrapped with at least one first combining wrapper, wherein the cooling tube and the filter are surrounded by a second combining wrapper extending partially on the tobacco segment to attach the filter and the cooling tube to the tobacco segment, wherein the cooling tube is formed between the filter and the tobacco segment by the first combining wrapper, which surrounds the filter and forms a cavity between the tobacco segment and the filter that extends along a certain length beyond the upstream hollow filter segment.
 2. The smoking construction according to claim 1, wherein the cooling tube comprises a paper material.
 3. The smoking construction according to claims 1, wherein the cooling tube extends along the longitudinal axis and has a length between about 15 mm and about 45 mm.
 4. The smoking construction according to claim 1, wherein the first combining wrapper is thicker and/or has a higher basis weight than the second combining wrapper.
 5. The smoking construction according to claims 1, wherein the cooling tube forms an empty cavity.
 6. The smoking construction according to claims 1, wherein the length of the cooling tube is larger than or equal to a length of the filter.
 7. The smoking construction according to claim 1, wherein the length of the cooling tube is larger or equal to a length of the tobacco segment.
 8. The smoking construction according to claim 1, wherein ventilation holes are provided in the cooling tube.
 9. The smoking construction according to claim 1, wherein the filled filter segment comprises acetate or paper tow.
 10. (canceled)
 11. The smoking construction according to claim 1, wherein the tobacco segment comprises reconstituted tobacco including strands of tobacco sheet and/or folded sheets comprising tobacco powder, and/or more than about wt. 5% of glycerin.
 12. The smoking construction according to claims 1, wherein the cooling tube comprises a tubular reinforcement material.
 13. The smoking construction according to claim 2, wherein the paper material has a weight higher than about 60 gsm.
 14. The smoking construction according to claim 1, wherein the cooling tube is filled with a filler material.
 15. The smoking construction according to claim 1, wherein the second combining wrapper overlaps the first combining wrapper along at least a part of the length of the first combining wrapper.
 16. The smoking construction according to claim 8, wherein the ventilation holes are formed by lasering through the first and second combining wrapper.
 17. A method for manufacturing a heat-not-burn smoking construction comprising the steps of: providing a tobacco segment and at least a first filter formed of at least two filter segments; wrapping the first filter with at least one first combining wrapper to obtain a first wrapped filter wherein a cooling tube is formed as a cavity surrounded by the first combining wrapper, wherein a length of the cooling tube is longer than a length of the first filter creating thereby a cavity at at least one side of the wrapped filter; and wrapping the first wrapped filter and at least a part of the tobacco segment with a second combining wrapper such that the cavity is situated between the filter and the tobacco segment.
 18. The method according to claim 17, further comprising an additional step of wrapping the first and a second filter with the first combining wrapper to obtain a double length wrapped filter, wherein a double length tube is formed between the first and second filter and wherein the length of the double length tube is equal to or longer than a length of the first and second filter together to create a cooling tube between the first and second filter.
 19. The method according to claim 17, further comprising an additional step of wrapping a double length filled filter segment and two hollow filter segments with a double length first combining wrapper to obtain a double length wrapped filter, wherein the double length first combining wrapper forms two cavities, which form cooling tubes, wherein at least one hollow filter segment is positioned between a cooling tube and the double length first filter.
 20. The method according to claim 18, further comprising an additional step of cutting the double length wrapped filter to create a first and a second wrapped filter comprising a first cooling tube and a second cooling tube.
 21. A method for manufacturing two heat-not-burn smoking constructions comprising the steps of: providing theft tobacco segment and the first and second wrapped filter according to claim 15; placing the tobacco segment between the first and second wrapped filter such that the cooling tube of each wrapped filter is positioned between the tobacco segment and a filter segment of each wrapped filter; wrapping each of the first and second wrapped filter and at least two parts of the tobacco segment with two separate second combining wrappers or wrapping the tobacco segment and the first and second wrapped filter with one common combining wrapper to create a double length smoking construction such that the cavity of each wrapped filter is created between each first and second filter and the tobacco segment; and cutting the double length smoking construction at a middle of the tobacco segment to create two smoking constructions. 